ANDREWS: PROTOPLASMIC STREAMING IN Mucor 499 
streaming, but has a tendency to decrease any streaming that may 
be present. When the filament is cut into two pieces, only an 
outflow occurs. This may, in time, heal and streaming be re- 
sumed. 
6. Light may cause and accelerate streaming when alternated 
with darkness in those fungal filaments that are in a condition for 
streaming. 
7. A sudden change of temperature of several degrees will 
cause streaming in these fungi. 
8. Contrary to Schroéter’s opinion, streaming may occur or be 
caused in unbranched as well as branched filaments. 
My thanks are due Professor W. Pfeffer for placing at my dis- 
posal the facilities of his laboratory for this investigation and also 
for his constant interest and kind assistance. 
INDIANA UNIVERSITY, 
BLOOMINGTON, IND. 
